I've watched this movie for years, and it never gets better, it never gets old, it remains an oldie but a 'goodie.' Nick Nolte is the basic good guy, just as Mr. Deeds was a basic good guy. His patience with his bratty little daughter makes you love him. Nothing makes you love the daughter, but at least you can hear echoes of her mother's opinions and effects of that upbringing - so, you give her a break. Anyone can grow out of that.
Albert Brooks is not the basic good guy. He's the opposite: the basic bad guy. Shallow, narcissistic, selfish, arrogant, with little room for improvement in that space harboring his huge overblown ego. Yet, watching him is entertaining. Toxic behavior amuses. You can be mesmerized by his grand show of insecurity, dislike him, and still laugh. You don't like him any better, but you had a laugh - at his expense. This is one of the things his girlfriend appreciates about him, and it makes her sad. Can he grow to be a real person, who is capable of feelings and listening? Possibly. It may take years and years and years!
The little girl who is the center of all the drama - and comedy - is a very good actor. I'm impressed that so many kids are giving great performances on the big screen now. Julia Butters in 'Once Upon a Time in Hollywood' is incredible, although she is older than the child in this movie, so no comparison is possible. It could be that writers are writing better parts for children, and the children are simply succeeding in those parts.